There will ALWAYS be someone better

Competition is natural and can be seen almost anywhere in nature. On top of that, humans (some would argue) are the only species that is "self aware". This awareness leads many to feel a need to be important, or to matter in the grand scheme of things. People look for areas that they can demonstrate their "specialness". Some are fast, some are strong, some are smart...The list is only limited by the imagination. Any time you find a person who claims to be good at something, you will soon find another person who claims to be better. So, humans have taken competition to another level because of egos.